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Design of an Inner Current Control Loop for a High-Voltage Pulsed Power Supply to Reduce Inverter Current Stress

Kateb, Sadra | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58701 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kaboli, Shahriyar
  7. Abstract:
  8. A power supply is an important part of every electrical system. It matches the energy from the main source to the needs of the load and must provide the correct voltage waveform and power for proper operation. In applications where the load works at high voltage and high power, pulse power supplies are needed to deliver a short high-power pulse with lower energy use. In this method, energy is stored in capacitors for a long time and then released to the load in a short moment. In this study, the load is a magnetron lamp, which needs high-quality voltage and power pulses for correct operation. To keep this quality, the output of the pulse power supply must be controlled accurately. After the system itself is designed, controlling the power supply is always a major challenge in power electronics, because its correct operation depends on the dynamic quality of the system and its control loop. In this research, the dynamics of the power supply were first studied using data-based identification and equation extraction. The results showed that the designed power supply has a nonlinear and nonuniform behavior. This means that increasing the input control signal does not always increase the output in the same way, and in some ranges the output even drops. This makes it difficult to control the power supply with linear controllers. By analyzing the equations and the internal behavior of the system, the cause of this nonuniformity was found, and a solution was proposed. After applying this solution, the dynamics of the power supply improved. After improving the system dynamics, a cascade controller was designed. The inner loop controls the capacitor charger current, so the rising slope of the capacitor voltage can be adjusted. This change made the charger dynamics behave like a linear equation, even though the system still contains nonlinear parts. As a result, the outer control loop—which strongly affects the final quality of the power supply and can damage the load if it works poorly—sees a linear behavior from the charger. This structure gives fast response, high reliability, and accurate control using linear controllers, and finally ensures the stability of the closed-loop system at all designed operating points
  9. Keywords:
  10. Capacitor Charging Power Supplies ; System Identification ; Flow Control ; Pulsed Power Supplies ; Nonlinear Nonuniform Dynamics ; Load Disturbance

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